Method and apparatus for transmitting harq-ack feedback information by a user equipment in a wireless communication system

ABSTRACT

A method, terminal, and base station for transmitting or receiving hybrid automatic repeat request acknowledgment (HARQ-ACK) information in a wireless communication system. The method includes receiving, from a base station (BS), first data on a first component carrier (CC) configured with frequency division duplex (FDD) and second data on a second CC configured with time division duplex (TDD), wherein one of the first and second CC is a primary CC (PCC) and another of the first and second CC is a secondary CC (SCC); determining HARQ-ACK timing for the first data based on a configuration of the PCC; determining HARQ-ACK timing for the second data based on the configuration of the PCC; transmitting, to the BS on the PCC, HARQ-ACK information for the first data using the determined HARQ-ACK timing for the first data and HARQ-ACK information for the second data using the determined HARQ-ACK timing for the second data.

PRIORITY

This patent application is a Continuation Application of U.S. patentapplication Ser. No. 13/945,601, filed in the United States Patent andTrademark Office on Jul. 18, 2013, which claims priority under 35 U.S.C.§119(a) to Chinese Patent Application Serial No. 201210249342.8, whichwas filed in the Chinese Patent Office on Jul. 18, 2012, the entirecontent of each of which are hereby incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present disclosure relates generally to radio communication systemtechnologies, and more particularly, to a method and apparatus fortransmitting Hybrid Automatic Repeat reQuest ACKnowledgment (HARQ-ACK)feedback information.

2. Description of the Related Art

A Long Term Evolution (LTE) system supports two duplexing modes, i.e.,Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD).

FIG. 1 illustrates a frame structure of a conventional TDD system.

Referring to FIG. 1, a length of each radio frame is 10 ms, and eachradio frame is divided into two 5 ms half-frames. Each half-frameincludes eight 0.5 ms time slots and three special fields, i.e., aDownlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an UplinkPilot Time Slot (UpPTS). The total length of the three special fields is1 ms.

Each subframe includes two consecutive time slots. For example, a framek includes slot 2k and slot 2k+1.

The TDD system supports seven TDD uplink/downlink configurations, asshown in Table 1 below. In Table 1, D denotes a downlink subframe, Udenotes an uplink subframe, and S denotes a special subframe with theabove-mentioned three special fields.

TABLE 1 Index number of Switching config- point index of subframeuration period 0 1 2 3 4 5 6 7 8 9 0  5 ms D S U U U D S U U U 1  5 ms DS U U D D S U U D 2  5 ms D S U D D D S U D D 3 10 ms D S U U U D D D DD 4 10 ms D S U U D D D D D D 5 10 ms D S U D D D D D D D 6 10 ms D S UU U D S U U D

To improve a user transmission rate, an LTE-Advanced (LTE-A) system hasbeen proposed. In LTE-A, multiple Component Carriers (CCs) areaggregated to obtain greater bandwidth, i.e., Carrier Aggregation (CA),which constitutes a downlink and an uplink of a communication system tosupport a higher transmission rate. For example, a 100 MHz bandwidth maybe achieved by aggregating five 20 MHz CCs. Herein, each CC may bereferred to as a Cell.

A Base Station (BS) may configure a User Equipment (UE) to work inmultiple CCs, one of which is a primary CC (PCC or Pcell), while anyother CCs are a secondary CC (SCC or Scell).

In the LTE-A system, all of the CCs aggregated together are configuredwith an FDD configuration or are all configured with a TDDconfiguration.

However, to further improve a user transmission rate, subsequentresearch is being performed on LTE-A in the hopes of determining amethod to effectively support a CC configured with a TDD configurationand a CC configured with a FDD configuration to perform carrieraggregation. For example, when carrier aggregation includes a CCconfigured with a TDD configuration and a CC configured with a FDDconfiguration, the is no current way for a UE to determine a HARQ-ACKtiming for transmitting HARQ-ACK.

SUMMARY OF THE INVENTION

Accordingly, the present invention is designed to address at least theproblems and/or disadvantages described above and to provide at leastthe advantages described below.

An aspect of the present invention is to provide a method and anapparatus for transmitting HARQ-ACK feedback information, which caneffectively achieve HARQ-ACK information transmission when a TDD CC andan FDD CC are aggregated.

In accordance with an aspect of the present invention, a method isprovided for transmitting hybrid automatic repeat request acknowledgment(HARQ-ACK) information by a terminal in a wireless communication system.The method includes receiving, from a base station (BS), first data on afirst component carrier (CC) configured with a frequency division duplex(FDD) and second data on a second CC configured with a time divisionduplex (TDD), wherein one of the first CC and the second CC is a primaryCC (PCC) and another of the first CC and the second CC is a secondary CC(SCC); determining a HARQ-ACK timing for the first data based on aconfiguration of the PCC; determining a HARQ-ACK timing for the seconddata based on the configuration of the PCC; transmitting, to the BS onthe PCC, HARQ-ACK information for the first data using the determinedHARQ-ACK timing for the first data and HARQ-ACK information for thesecond data using the determined HARQ-ACK timing for the second data.

In accordance with another aspect of the present invention, a method forreceiving hybrid automatic repeat request acknowledgment (HARQ-ACK)information by a base station (BS) in a wireless communication system isprovided. The method includes transmitting, to a terminal, first data ona first component carrier (CC) configured with a frequency divisionduplex (FDD) and second data on a second CC configured with a timedivision duplex (TDD), wherein one of the first CC and the second CC isa primary CC (PCC) and another of the first CC and the second CC is asecondary CC (SCC); and receiving, from the terminal on the PCC,HARQ-ACK information for the first data with a HARQ-ACK timing for thefirst data and HARQ-ACK information for the second data with a HARQ-ACKtiming for the first data, wherein the HARQ-ACK timing for the firstdata and the HARQ-ACK timing for the second data are determined based ona configuration of the PCC.

In accordance with another aspect of the present invention, a terminalfor transmitting hybrid automatic repeat request acknowledgment(HARQ-ACK) information in a wireless communication system is provided.The terminal includes a transceiver; and a controller coupled to thetransceiver, wherein the controller is configured to: receive, from abase station (BS), first data on a first component carrier (CC)configured with a frequency division duplex (FDD) and second data on asecond CC configured with a time division duplex (TDD), wherein one ofthe first CC and the second CC is a primary CC (PCC) and another of thefirst CC and the second CC is a secondary CC (SCC); determine a HARQ-ACKtiming for the first data based on a configuration of the PCC; determinea HARQ-ACK timing for the second data based on the configuration of thePCC; transmit, to the BS on the PCC, HARQ-ACK information for the firstdata using the determined HARQ-ACK timing for the first data andHARQ-ACK information for the second data using the determined HARQ-ACKtiming for the second data.

In accordance with another aspect of the present invention, a basestation (BS) for receiving hybrid automatic repeat requestacknowledgment (HARQ-ACK) information in a wireless communication systemis provided. The BS includes a transceiver; and a controller coupled tothe transceiver, wherein the controller is configured to: transmit, to aterminal, first data on a first component carrier (CC) configured with afrequency division duplex (FDD) and second data on a second CCconfigured with a time division duplex (TDD), wherein one of the firstCC and the second CC is a primary CC (PCC) and another of the first CCand the second CC is a secondary CC (SCC); and receive, from theterminal on the PCC, HARQ-ACK information for the first data with aHARQ-ACK timing for the first data and HARQ-ACK information for thesecond data with a HARQ-ACK timing for the first data, wherein each ofthe HARQ-ACK timing for the first data and the HARQ-ACK timing for thesecond data is determined based on a configuration of the PCC.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the present invention will be more apparent from thefollowing description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 illustrates a frame structure in a conventional TDD system;

FIG. 2 is a flowchart illustrating a method for transmitting HARQ-ACKfeedback information in accordance with an embodiment of the presentinvention;

FIG. 3 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention;

FIG. 4 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention;

FIG. 5 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention;

FIG. 6 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention;

FIG. 7 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention;

FIG. 8 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention;

FIG. 9 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention; and

FIG. 10 is a block diagram illustrating a UE according to an embodimentof the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

Various embodiments of the present invention will now be described indetail with reference to the accompanying drawings. In the followingdescription, specific details such as detailed configuration andcomponents are merely provided to assist the overall understanding ofthese embodiments of the present invention. Therefore, it should beapparent to those skilled in the art that various changes andmodifications of the embodiments described herein can be made withoutdeparting from the scope and spirit of the present invention. Inaddition, descriptions of well-known functions and constructions areomitted for clarity and conciseness.

For a TDD uplink/downlink configuration, according to a ratio ofdownlink subframes and uplink subframes, HARQ-ACK feedback informationof a downlink transmission within zero, i.e., no HARQ-ACK feedbackinformation is transmitted in the uplink subframe, at least one downlinksubframe may be transmitted in one uplink subframe. The zero downlinksubframes for which the HARQ-ACK feedback information is transmittedwithin a same uplink subframe is referred to as “a bundling window”corresponding to the uplink subframe. Accordingly, the number of thedownlink subframes included in the bundling window referred to as thesize of the bundling window.

For a UE of a CA system configured with a TDD CC and an FDD CC, it isassumed herein that CCs configured for the UE include at least one FDDCC and at least one TDD CC.

FIG. 2 is a flowchart illustrating a method for transmitting HARQ-ACKfeedback information in accordance with an embodiment of the presentinvention.

Referring to FIG. 2, in step 201, a UE determines a HARQ-ACK timing anda CC transmitting HARQ-ACK feedback information, based on a compositionstructure of CCs configured for the UE.

In step 202, the UE transmits the HARQ-ACK feedback information on aPUCCH or a PUSCH of the determined CC, based on the determined HARQ-ACKtiming.

In accordance with an embodiment of the present invention, CCsconfigured for a UE are grouped into two groups, i.e., all CCsconfigured with an FDD configuration are grouped into one group, and allCCs configured with a TDD configuration are grouped into the othergroup. All of the CCs in the group with the FDD configuration follow anFDD HARQ-ACK timing, and all HARQ-ACK information of the group istransmitted on the PCC. For each of the CCs in the group with the TDDconfiguration, a HARQ-ACK timing is determined according to TDDuplink/downlink configurations of the CCs in the group (as shown inTable 1 above), and all HARQ-ACK information of the group with TDDconfiguration is transmitted on a specific CC determined from the TDDCCs.

RRC signaling may be used to indicate which CC is used for transmittingthe HARQ-ACK information among the CCs in the group with TDDconfiguration. The indicated CC is commonly referred to as a second PCC.

FIG. 3 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention. In FIG. 3, it is assumed that a BSconfigures two CCs for a CA UE, i.e., a PCC and an SCC.

Referring to FIG. 3, the PCC is configured with an FDD configuration,and the SCC is configured with TDD uplink/downlink configuration 2. Inthis combination, the PCC follows an FDD HARQ-ACK timing, and HARQ-ACKinformation of the PCC is transmitted on the PCC. The SCC follows aHARQ-ACK timing of TDD uplink/downlink configuration 2, and HARQ-ACKinformation of the SCC is transmitted on the SCC.

In accordance with an embodiment of the present invention, CCsconfigured for the UE are grouped into two groups, i.e., all of the CCsconfigured with an FDD configuration are grouped into one group, and allof the CCs configured with a TDD configuration are grouped into theother group. All of the CCs in the group with the FDD configurationfollow an FDD HARQ-ACK timing, and HARQ-ACK information of the group istransmitted on the PCC. The CCs in the group with the TDD configurationdetermine a HARQ-ACK timing for each CC according to TDD uplink/downlinkconfigurations of the CCs in the group, and HARQ-ACK information of thegroup with TDD configuration is transmitted on the FDD PCC.

FIG. 4 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention. In FIG. 4, it is assumed that a BSconfigures two CCs for a CA UE, i.e., a PCC and an SCC.

Referring to FIG. 4, the PCC is configured with an FDD configuration,and the SCC is configured with TDD uplink/downlink configuration 2. Inthis combination, the PCC follows an FDD HARQ-ACK timing, and HARQ-ACKinformation of the PCC is transmitted on the PCC. The SCC follows aHARQ-ACK timing of TDD uplink/downlink configuration 2, and HARQ-ACKinformation of the SCC is transmitted on the FDD PCC.

In accordance with an embodiment of the present invention, all CCsconfigured for the UE follow an FDD HARQ-ACK timing, and all HARQ-ACKinformation is transmitted on the FDD PCC. Specifically, an FDD CCfollows the FDD HARQ-ACK timing. For a TDD CC, a HARQ-ACK timing of aTDD downlink subframe is determined according to a HARQ-ACK timing of anFDD downlink subframe that is on the same subframe timing as the TDDdownlink subframe. HARQ-ACK information of all of the CCs is transmittedon the FDD PCC. In this method, timing of all of the CCs is consistent,and HARQ-ACK information of all of the CCs is transmitted on the PCC, sothat the implementation complexity is lower compared with the methodsillustrated in FIGS. 3 and 4.

FIG. 5 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention. In FIG. 5, it is assumed that a BSconfigures two CCs for a CA UE, i.e., a PCC and an SCC.

Referring to FIG. 5, the PCC is configured with an FDD configuration,and the SCC is configured with TDD uplink/downlink configuration 2. Inthis combination, the PCC follows an FDD HARQ-ACK timing, and HARQ-ACKinformation of the PCC is transmitted on the PCC. The SCC follows theFDD HARQ-ACK timing, and HARQ-ACK information of the SCC is transmittedon the PCC.

In accordance with an embodiment of the present invention, CCsconfigured for the UE are grouped into two groups, i.e., all of the CCsconfigured with an FDD configuration are grouped into one group, and allof the CCs configured with a TDD configuration are grouped into theother group. All of the CCs in the group with the FDD configurationfollow an FDD HARQ-ACK timing, and HARQ-ACK information of the group istransmitted on a specific FDD PCC. For each CC in the group with the TDDconfiguration, a HARQ-ACK timing is determined according to TDDuplink/downlink configurations of the CCs in the group, and HARQ-ACKinformation of the group with the TDD configuration is transmitted onthe PCC.

FIG. 6 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention. In FIG. 6, it is assumed that a BSconfigures two CCs for a CA UE, i.e., a PCC and an SCC.

Referring to FIG. 6, the PCC is configured with TDD uplink/downlinkconfiguration 2, and the SCC is configured with an FDD configuration. Inthis combination, the PCC follows a HARQ-ACK timing of TDDuplink/downlink configuration 2, and HARQ-ACK information of the PCC istransmitted on the PCC. The SCC follows an FDD HARQ-ACK timingrelationship, and HARQ-ACK information of the SCC is transmitted on theSCC.

In accordance with an embodiment of the present invention, CCsconfigured for the UE are grouped into two groups, i.e., all of the CCsconfigured with an FDD configuration are grouped into one group, and allof the CCs configured with a TDD configuration are grouped into theother group. All of the CCs in the group with the FDD configurationfollow an FDD HARQ-ACK timing. When the PCC is an uplink subframe,HARQ-ACK information of the group with the FDD configuration istransmitted on the PCC. When the PCC is a downlink subframe, theHARQ-ACK information of the group with the FDD configuration istransmitted on a specific FDD CC. For each CC in the group with the TDDconfiguration a HARQ-ACK timing is determined according to TDDuplink/downlink configurations of the CCs in the group, and HARQ-ACKinformation of the group with the TDD configuration is transmitted onthe PCC. As described above, HARQ-ACK information of each CC istransmitted through the PCC as much as possible, thus it is consistentwith previous HARQ-ACK transmission modes. When the PCC is a downlinksubframe and cannot transmit HARQ-ACK information, the HARQ-ACKinformation is transmitted through an FDD CC.

Again, RRC signaling may be used to indicate which CC is used fortransmitting the HARQ-ACK information among the CCs in the group withFDD configuration. The indicated CC is called a second PCC.

FIG. 7 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention. In FIG. 7, it is assumed that a BSconfigures two CCs for a CA UE, i.e., a PCC and an SCC.

Referring to FIG. 7, the PCC is configured with TDD uplink/downlinkconfiguration 2, and the SCC is configured with an FDD configuration. Inthis combination, the PCC follows a HARQ-ACK timing of the TDDuplink/downlink configuration 2, and HARQ-ACK information of the PCC istransmitted on the PCC. The SCC follows an FDD HARQ-ACK timing, HARQ-ACKinformation of the SCC is transmitted on the PCC in subframe 2 orsubframe 7, and the HARQ-ACK information of the SCC is transmitted onthe SCC in subframes 0, 1, 3, 4, 5, 6, 8, or 9.

In accordance with an embodiment of the present invention, CCsconfigured for the UE are grouped into two groups, i.e., all of the CCsconfigured with an FDD configuration are grouped into one group, and allof the CCs configured with a TDD configuration are grouped into theother group. All FDD CCs follow a HARQ-ACK timing of the PCC. However,for each CC in the group with the TDD configuration, HARQ-ACK timing isdetermined according to the TDD uplink/downlink configurations of theCCs in the group. HARQ-ACK information of all of the CCs is transmittedon the PCC.

Specifically, for a downlink subframe of an FDD CC, if the PCC is adownlink subframe on the same subframe timing, a HARQ-ACK timing of theFDD downlink subframe is determined according to a HARQ-ACK timing ofthe downlink subframe of the PCC on the same subframe. For the downlinksubframe of the FDD CC, if the PCC is an uplink subframe on the samesubframe timing, there is not a corresponding uplink subframe used fortransmitting the HARQ-ACK information on the same subframe in accordancewith a HARQ-ACK timing of the PCC, then the FDD subframe could nottransmit downlink data. For each CC in the group with TDD configurationa HARQ-ACK timing is determined according to a TDD uplink/downlinkconfiguration of each CC in the group. HARQ-ACK information of all ofthe CCs is transmitted on the PCC. Herein, HARQ-ACK timing of all of theCCs is consistent, and HARQ-ACK of all of the CCs is transmitted on thePCC, so that the implementation complexity is lower compared with themethods illustrates in FIGS. 6 and 7. However, part of downlinksubframes may not be able to transmit downlink data on the FDD CC, whichresults in waste of downlink resources.

FIG. 8 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention. In FIG. 8, it is assumed that a BSconfigures two CCs for a CA UE, i.e., a PCC and an SCC.

Referring to FIG. 8, the PCC is configured with TDD uplink/downlinkconfiguration 2, and the SCC is configured with an FDD configuration. Inthis combination, the PCC follows a HARQ-ACK timing of TDDuplink/downlink configuration 2, and HARQ-ACK information of the PCC istransmitted on the PCC. The SCC follows the HARQ-ACK timing of the TDDuplink/downlink configuration 2, HARQ-ACK information of downlinksubframes 4, 5, 6, and 8 of radio frame n is transmitted on uplinksubframe 2 of radio frame n+1 of the PCC, and HARQ-ACK information ofdownlink subframe 9 of radio frame n and HARQ-ACK information ofdownlink subframes 0, 1, and 3 of radio frame n+1 are transmitted onuplink subframe 7 of radio frame n+1 of the PCC. For the SCC anddownlink subframes 2 and 7 of radio frame n, subframes 2 and 7 of thePCC are all uplink subframes, therefore, downlink subframes 2 and 7 ofthe SCC do not transmit downlink data.

In accordance with an embodiment of the present invention, for each CCin the group with TDD configuration, a HARQ-ACK timing is determinedaccording to TDD uplink/downlink configurations of the CCs in the group,and HARQ-ACK information of the PCC is transmitted on the PCC. HARQ-ACKinformation of downlink subframes is distributed by FDD CCs as evenly aspossible on each uplink subframe of the PCC for transmission. That is,it is ensured that the number of subframes difference among FDD HARQ-ACKinformation transmitted by each uplink subframe of the PCC is thesmallest one.

FIG. 9 illustrates HARQ-ACK timing and a determination of a CCtransmitting HARQ-ACK feedback information in accordance with anembodiment of the present invention. In FIG. 9, HARQ-ACK timing of FDDCCs are completely rearranged, but the HARQ-ACK information transmittedon each uplink subframe of the PCC is distributed more averagely.Herein, more averagely means that the number of downlink subframes onwhich HARQ-ACK are transmitted in one uplink subframes keeps as equal aspossible for each uplink subframe. As a result, uplink resources areused fully and evenly.

Referring to FIG. 9, the PCC is configured with TDD uplink/downlinkconfiguration 2, and the SCC is configured with an FDD configuration. Inthis combination, the PCC follows a HARQ-ACK timing of TDDuplink/downlink configuration 2, and HARQ-ACK information of the PCC istransmitted on the PCC. The SCC follows a new HARQ-ACK timing, so thatthe number of downlink subframes for which the FDD HARQ-ACK informationis transmitted on uplink subframes of the PCC is more average, and theshortest duration for the UE processing data is met. Generally, thesmaller a time delay between transmission of HARQ-ACK feedback of adownlink subframe and transmission of the downlink subframe is, thebetter. HARQ-ACK feedback information of downlink subframes 4, 5, 6, 7,and 8 of radio frame n may be transmitted on uplink subframe 2 of radioframe n+1 of the PCC, and HARQ-ACK feedback information of downlinksubframe 9 of radio frame n and HARQ-ACK feedback information ofdownlink subframes 0, 1, 2, and 3 of radio frame n+1 may be transmittedon uplink subframe 7 of radio frame n+1 of the PCC.

The above-described methods for determining the timing and the CCtransmitting the HARQ-ACK, as illustrated in FIGS. 3 to 9, are alsoapplicable to a scenario in which HARQ-ACK information is carriedthrough a PUSCH or a PUCCH.

In conventional systems, when HARQ-ACK information is carried through aPUSCH under a TDD configuration, if the PUSCH carrying the HARQ-ACKinformation is scheduled through a Physical Downlink Control CHannel(PDCCH), then the PDCCH includes an Uplink Downlink Assignment Index (ULDAI) field, which is used to indicate the number of downlink subframescorresponding to the HARQ-ACK information carried in the PUSCH. When theHARQ-ACK information is carried through the PUSCH under an FDDconfiguration, uplink subframes carrying the HARQ-ACK information aredetermined. Therefore, the PDCCH scheduling the PUSCH does not includethe UL DAI field. For a CA UE simultaneously configured with the TDD andFDD configurations, the number of downlink subframes corresponding toHARQ-ACK feedback information transmitted on a current uplink subframemay be determined according to methods described below.

Specifically, if HARQ-ACK information is transmitted on a PUSCH and thePUSCH transmission is scheduled by a PDCCH that does not include a ULDAI field or the PUSCH transmission is not scheduled by a detectedPDCCH, for a CC, the number of downlink subframes for which HARQ-ACKfeedback information is transmitted on the PUSCH of the current uplinksubframe is the size of a bundling window of the CC.

If the PUSCH transmission is scheduled by a PDCCH including the UL DAIfield, then for any CC, the number of downlink subframes for whichHARQ-ACK feedback information is transmitted on the PUSCH of the currentuplink subframe is determined according to the size of the bundlingwindow of the CC and the UL DAI. Particularly, the number of thedownlink subframes is equal to the minimum value between the size of thebundling window and a value of the UL DAI field.

For a BS that configures two CCs for a CA UE, i.e., a PCC and an SCC,the PCC may be configured with an FDD configuration, and the SCC may beconfigured with TDD uplink/downlink configuration 2. In thiscombination, assuming that the PCC follows an FDD HARQ-ACK timing andthe SCC follows the FDD HARQ-ACK timing, if a PUSCH is transmitted onthe PCC and a PDCCH scheduling the PUSCH of the FDD CC does not includea UL DAI field, the number of downlink subframes corresponding toHARQ-ACK information of the FDD CC or the TDD CC is equal to the size ofa bundling window of each CC. If the PUSCH is transmitted on the SCC andis scheduled by the PDCCH, and the PDCCH scheduling the PUSCH of the TDDCC includes the UL DAI field, the number of downlink subframescorresponding to HARQ-ACK information of the FDD CC and the number ofdownlink subframes corresponding to HARQ-ACK information of the TDD CCare respectively equal to min.{UL DAI, the size of the bundling windowof the CC}.

In addition, after a HARQ-ACK timing and a CC transmitting transmissionHARQ-ACK are determined, as described above, when the HARQ-ACKinformation is transmitted according to PUCCH format 1b for channelselection, mapping the HARQ-ACK information may be performed using a TDDtable for mapping, i.e., Table 5, Table 6, or Table 7, as shown below.Another method is to use an FDD table for mapping, i.e., Table 2, Table3, or Table 4, as shown below.

It is noted that various embodiments of the present invention describedherein are not limited to the use of a channel selection mapping form,which has already existed in a conventional LTE system, and may useother channel selection mapping forms.

TABLE 2 HARQ- HARQ- ACK(0) ACK(1) n_(PUCCH) ⁽¹⁾ b(0)b(1) ACK ACKn_(PUCCH,1) ⁽¹⁾ 1, 1 ACK NACK/DTX n_(PUCCH,0) ⁽¹⁾ 1, 1 NACK/DTX ACKn_(PUCCH,1) ⁽¹⁾ 0, 0 NACK NACK/DTX n_(PUCCH,0) ⁽¹⁾ 0, 0 DTX NACK/DTX NoTransmission

TABLE 3 HARQ- HARQ- HARQ- ACK(0) ACK(1) ACK(2) n_(PUCCH) ⁽¹⁾ b(0)b(1)ACK ACK ACK n_(PUCCH,1) ⁽¹⁾ 1, 1 ACK NACK/DTX ACK n_(PUCCH,1) ⁽¹⁾ 1, 0NACK/DTX ACK ACK n_(PUCCH,1) ⁽¹⁾ 0, 1 NACK/DTX NACK/DTX ACK n_(PUCCH,2)⁽¹⁾ 1, 1 ACK ACK NACK/DTX n_(PUCCH,0) ⁽¹⁾ 1, 1 ACK NACK/DTX NACK/DTXn_(PUCCH,0) ⁽¹⁾ 1, 0 NACK/DTX ACK NACK/DTX n_(PUCCH,0) ⁽¹⁾ 0, 1 NACK/DTXNACK/DTX NACK n_(PUCCH,2) ⁽¹⁾ 0, 0 NACK NACK/DTX DTX n_(PUCCH,0) ⁽¹⁾ 0,0 NACK/DTX NACK DTX n_(PUCCH,0) ⁽¹⁾ 0, 0 DTX DTX DTX No Transmission

TABLE 4 HARQ- HARQ- HARQ-ACK(0) ACK(1) ACK(2) HARQ-ACK(3) n_(PUCCH) ⁽¹⁾b(0)b(1) ACK ACK ACK ACK n_(PUCCH,1) ⁽¹⁾ 1, 1 ACK NACK/DTX ACK ACKn_(PUCCH,2) ⁽¹⁾ 0, 1 NACK/DTX ACK ACK ACK n_(PUCCH,1) ⁽¹⁾ 0, 1 NACK/DTXNACK/DTX ACK ACK n_(PUCCH,3) ⁽¹⁾ 1, 1 ACK ACK ACK NACK/DTX n_(PUCCH,1)⁽¹⁾ 1, 0 ACK NACK/DTX ACK NACK/DTX n_(PUCCH,2) ⁽¹⁾ 0, 0 NACK/DTX ACK ACKNACK/DTX n_(PUCCH,1) ⁽¹⁾ 0, 0 NACK/DTX NACK/DTX ACK NACK/DTX n_(PUCCH,3)⁽¹⁾ 1, 0 ACK ACK NACK/DTX ACK n_(PUCCH,2) ⁽¹⁾ 1, 1 ACK NACK/DTX NACK/DTXACK n_(PUCCH,2) ⁽¹⁾ 1, 0 NACK/DTX ACK NACK/DTX ACK n_(PUCCH,3) ⁽¹⁾ 0, 1NACK/DTX NACK/DTX NACK/DTX ACK n_(PUCCH,3) ⁽¹⁾ 0, 0 ACK ACK NACK/DTXNACK/DTX n_(PUCCH,0) ⁽¹⁾ 1, 1 ACK NACK/DTX NACK/DTX NACK/DTX n_(PUCCH,0)⁽¹⁾ 1, 0 NACK/DTX ACK NACK/DTX NACK/DTX n_(PUCCH,0) ⁽¹⁾ 0, 1 NACK/DTXNACK NACK/DTX NACK/DTX n_(PUCCH,0) ⁽¹⁾ 0, 0 NACK NACK/DTX NACK/DTXNACK/DTX n_(PUCCH,0) ⁽¹⁾ 0, 0 DTX DTX NACK/DTX NACK/DTX No Transmission

TABLE 5 HARQ-ACK(0), HARQ- ACK(1) n_(PUCCH) ⁽¹⁾ b(0)b(1) ACK, ACKn_(PUCCH,1) ⁽¹⁾ 1, 0 ACK, NACK/DTX n_(PUCCH,0) ⁽¹⁾ 1, 1 NACK/DTX, ACKn_(PUCCH,1) ⁽¹⁾ 0, 1 NACK, NACK/DTX n_(PUCCH,0) ⁽¹⁾ 0, 0 DTX, NACK/DTXNo Transmission

TABLE 6 HARQ-ACK(0), HARQ- ACK(1), HARQ-ACK(2) n_(PUCCH) ⁽¹⁾ b(0)b(1)ACK, ACK, ACK n_(PUCCH) ⁽¹⁾ 1, 1 ACK, ACK, NACK/DTX n_(PUCCH) ⁽¹⁾ 1, 0ACK, NACK/DTX, ACK n_(PUCCH) ⁽¹⁾ 1, 0 ACK, NACK/DTX, n_(PUCCH) ⁽¹⁾ 1, 1NACK/DTX NACK/DTX, ACK, ACK n_(PUCCH) ⁽¹⁾ 0, 1 NACK/DTX, ACK, n_(PUCCH)⁽¹⁾ 0, 1 NACK/DTX NACK/DTX, NACK/DTX, n_(PUCCH) ⁽¹⁾ 0, 0 ACK NACK,NACK/DTX, n_(PUCCH) ⁽¹⁾ 0 0 NACK/DTX DTX, NACK/DTX, No NACK/DTXTransmission

TABLE 7 HARQ-ACK(0), HARQ-ACK(1), HARQ- ACK(2), HARQ-ACK(3) n_(PUCCH)⁽¹⁾ b(0)b(1) ACK, ACK, ACK, ACK n_(PUCCH,1) ⁽¹⁾ 1, 1 ACK, ACK, ACK,NACK/DTX n_(PUCCH,2) ⁽¹⁾ 1, 1 ACK, ACK, NACK/DTX, ACK n_(PUCCH,0) ⁽¹⁾ 1,0 ACK, ACK, NACK/DTX, NACK/DTX n_(PUCCH,1) ⁽¹⁾ 1, 0 ACK, NACK/DTX, ACK,ACK n_(PUCCH,3) ⁽¹⁾ 1, 1 ACK, NACK/DTX, ACK, NACK/DTX n_(PUCCH,2) ⁽¹⁾ 1,0 ACK, NACK/DTX, NACK/DTX, ACK n_(PUCCH,0) ⁽¹⁾ 0, 1 ACK, NACK/DTX,NACK/DTX, NACK/DTX n_(PUCCH,0) ⁽¹⁾ 1, 1 NACK/DTX, ACK, ACK, ACKn_(PUCCH,1) ⁽¹⁾ 0, 0 NACK/DTX, ACK, ACK, NACK/DTX n_(PUCCH,2) ⁽¹⁾ 0, 1NACK/DTX, ACK, NACK/DTX, ACK n_(PUCCH,3) ⁽¹⁾ 1, 0 NACK/DTX, ACK,NACK/DTX, NACK/DTX n_(PUCCH,1) ⁽¹⁾ 0, 1 NACK/DTX, NACK/DTX, ACK, ACKn_(PUCCH,3) ⁽¹⁾ 0, 1 NACK/DTX, NACK/DTX, ACK, NACK/DTX n_(PUCCH,2) ⁽¹⁾0, 0 NACK/DTX, NACK/DTX, NACK/DTX, ACK n_(PUCCH,3) ⁽¹⁾ 0, 0 NACK,NACK/DTX, NACK/DTX, NACK/DTX n_(PUCCH,0) ⁽¹⁾ 0, 0 DTX, NACK/DTX,NACK/DTX, NACK/DTX No Transmission

As shown above, when transmitting HARQ-ACK feedback information, whereina CC is configured with a TDD configuration and a CC configured with anFDD configuration in a CA simultaneously, a HARQ-ACK timing and a CCtransmitting HARQ-ACK feedback information are determined according to acomposition structure of CCs. The HARQ-ACK feedback information istransmitted on the determined CC according to the determined HARQ-ACKtiming. Therefore, HARQ-ACK information can be transmitted effectivelywhen a CC is configured with a TDD configuration and a CC is configuredwith an FDD configuration, simultaneously, in CA.

FIG. 10 is a block diagram illustrating a UE according to an embodimentof the present invention.

Referring to FIG. 10, the UE includes a receiver 1000, a controller1002, and a transmitter 1004. The UE may also include other units, e.g.,a display, a keypad, etc., which are not shown here for purposes ofclarity.

The receiver 1000 receives signals and data. The transmitter 1004transmits signals, data, and HARQ-ACK feedback information. Thecontroller 1002 controls the receiver 1000 and the transmitter 1004.

Specifically, the controller 1002 performs operations according to theabove-described embodiments of the present invention. For example, thecontroller 1002 determines a HARQ-ACK timing and a CC for transmittingthe HARQ-ACK feedback information, based on a composition structure ofCCs configured for the UE, and controls to the transmitter 1004 totransmit the HARQ-ACK feedback information on a PUCCH or PUSCH of thedetermined CC, based on the determined HARQ-ACK timing.

While the present invention has been particularly shown and describedwith reference to certain embodiments thereof, it will be understood bythose of ordinary skill in the art that various changes in form anddetails may be made therein without departing from the spirit and scopeof the present invention as defined by the following claims and theirequivalents.

What is claimed is:
 1. A method for transmitting hybrid automatic repeatrequest acknowledgment (HARQ-ACK) information by a terminal in awireless communication system, the method comprising: receiving, from abase station (BS), first data on a first component carrier (CC)configured with a frequency division duplex (FDD) and second data on asecond CC configured with a time division duplex (TDD), wherein one ofthe first CC and the second CC is a primary CC (PCC) and another of thefirst CC and the second CC is a secondary CC (SCC); determining aHARQ-ACK timing for the first data based on a configuration of the PCC;determining a HARQ-ACK timing for the second data based on theconfiguration of the PCC; transmitting, to the BS on the PCC, HARQ-ACKinformation for the first data using the determined HARQ-ACK timing forthe first data and HARQ-ACK information for the second data using thedetermined HARQ-ACK timing for the second data.
 2. The method of claim1, wherein the first CC is the PCC, the HARQ-ACK timing for the firstdata is determined based on an FDD HARQ-ACK timing, the HARQ-ACK timingfor the second data is determined based on the FDD HARQ-ACK timing, andthe HARQ-ACK information for the first data and the HARQ-ACK informationfor the second data is transmitted on the first CC using the determinedHARQ-ACK timing for the first data and the determined HARQ-ACK timingfor the second data, respectively.
 3. The method of claim 2, wherein theHARQ-ACK information for the first data is transmitted after foursubframes later from a subframe when the first data is received, and theHARQ-ACK information for the second data is transmitted after foursubframes later from a subframe when the second data is received.
 4. Themethod of claim 1, wherein the second CC is the PCC, the HARQ-ACK timingfor the first data is determined based on a TDD HARQ-ACK timing, theHARQ-ACK timing for the second data is determined based on the TDDHARQ-ACK timing, and the HARQ-ACK information for the first data and theHARQ-ACK information for the second data is transmitted on the second CCusing the determined HARQ-ACK timing for the first data and thedetermined HARQ-ACK timing for the second data, respectively.
 5. Themethod of claim 4, wherein the TDD HARQ-ACK timing is determined basedon an uplink(UL)/downlink(DL) configuration of the second CC.
 6. Amethod for receiving hybrid automatic repeat request acknowledgment(HARQ-ACK) information by a base station (BS) in a wirelesscommunication system, the method comprising: transmitting, to aterminal, first data on a first component carrier (CC) configured with afrequency division duplex (FDD) and second data on a second CCconfigured with a time division duplex (TDD), wherein one of the firstCC and the second CC is a primary CC (PCC) and another of the first CCand the second CC is a secondary CC (SCC); and receiving, from theterminal on the PCC, HARQ-ACK information for the first data with aHARQ-ACK timing for the first data and HARQ-ACK information for thesecond data with a HARQ-ACK timing for the first data, wherein theHARQ-ACK timing for the first data and the HARQ-ACK timing for thesecond data are determined based on a configuration of the PCC.
 7. Themethod of claim 6, wherein the first CC is the PCC, the HARQ-ACK timingfor the first data is determined based on an FDD HARQ-ACK timing, theHARQ-ACK timing for the second data is determined based on the FDDHARQ-ACK timing, and the HARQ-ACK information for the first data and theHARQ-ACK information for the second data is received on the first CCwith the determined HARQ-ACK timing for the first data and thedetermined HARQ-ACK timing for the second data, respectively.
 8. Themethod of claim 7, wherein the HARQ-ACK information for the first datais received after four subframes later from a subframe when the firstdata is received, and the HARQ-ACK information for the second data isreceived after four subframes later from a subframe when the second datais received.
 9. The method of claim 6, wherein the second CC is the PCC,the HARQ-ACK timing for the first data is determined based on a TDDHARQ-ACK timing, the HARQ-ACK timing for the second data is determinedbased on the TDD HARQ-ACK timing, and the HARQ-ACK information for thefirst data and the HARQ-ACK information for the second data is receivedon the second CC with the determined HARQ-ACK timing for the first dataand the determined HARQ-ACK timing for the second data, respectively.10. The method of claim 9, wherein the TDD HARQ-ACK timing is determinedbased on an uplink(UL)/downlink(DL) configuration of the second CC. 11.A terminal for transmitting hybrid automatic repeat requestacknowledgment (HARQ-ACK) information in a wireless communicationsystem, the terminal comprising: a transceiver; and a controller coupledto the transceiver, wherein the controller is configured to: receive,from a base station (BS), first data on a first component carrier (CC)configured with a frequency division duplex (FDD) and second data on asecond CC configured with a time division duplex (TDD), wherein one ofthe first CC and the second CC is a primary CC (PCC) and another of thefirst CC and the second CC is a secondary CC (SCC); determine a HARQ-ACKtiming for the first data based on a configuration of the PCC; determinea HARQ-ACK timing for the second data based on the configuration of thePCC; transmit, to the BS on the PCC, HARQ-ACK information for the firstdata using the determined HARQ-ACK timing for the first data andHARQ-ACK information for the second data using the determined HARQ-ACKtiming for the second data.
 12. The terminal of claim 11, wherein thefirst CC is the PCC, the HARQ-ACK timing for the first data isdetermined based on an FDD HARQ-ACK timing, the HARQ-ACK timing for thesecond data is determined based on the FDD HARQ-ACK timing, and theHARQ-ACK information for the first data and the HARQ-ACK information forthe second data is transmitted on the first CC using the determinedHARQ-ACK timing for the first data and the determined HARQ-ACK timingfor the second data, respectively.
 13. The terminal of claim 12, whereinthe HARQ-ACK information for the first data is transmitted after foursubframes later from a subframe when the first data is received, and theHARQ-ACK information for the second data is transmitted after foursubframes later from a subframe when the second data is received. 14.The terminal of claim 11, wherein the second CC is the PCC, the HARQ-ACKtiming for the first data is determined based on a TDD HARQ-ACK timing,the HARQ-ACK timing for the second data is determined based on the TDDHARQ-ACK timing, and the HARQ-ACK information for the first data and theHARQ-ACK information for the second data is transmitted on the second CCusing the determined HARQ-ACK timing for the first data and thedetermined HARQ-ACK timing for the second data, respectively.
 15. Theterminal of claim 14, wherein the TDD HARQ-ACK timing is determinedbased on an uplink(UL)/downlink(DL) configuration of the second CC. 16.A base station (BS) for receiving hybrid automatic repeat requestacknowledgment (HARQ-ACK) information in a wireless communicationsystem, the BS comprising: a transceiver; and a controller coupled tothe transceiver, wherein the controller is configured to: transmit, to aterminal, first data on a first component carrier (CC) configured with afrequency division duplex (FDD) and second data on a second CCconfigured with a time division duplex (TDD), wherein one of the firstCC and the second CC is a primary CC (PCC) and another of the first CCand the second CC is a secondary CC (SCC); and receive, from theterminal on the PCC, HARQ-ACK information for the first data with aHARQ-ACK timing for the first data and HARQ-ACK information for thesecond data with a HARQ-ACK timing for the first data, wherein each ofthe HARQ-ACK timing for the first data and the HARQ-ACK timing for thesecond data is determined based on a configuration of the PCC.
 17. TheBS of claim 16, wherein the first CC is the PCC, the HARQ-ACK timing forthe first data is determined based on an FDD HARQ-ACK timing, theHARQ-ACK timing for the second data is determined based on the FDDHARQ-ACK timing, and the HARQ-ACK information for the first data and theHARQ-ACK information for the second data is received on the first CCwith the determined HARQ-ACK timing for the first data and thedetermined HARQ-ACK timing for the second data, respectively.
 18. The BSof claim 17, wherein the HARQ-ACK information for the first data isreceived after four subframes later from a subframe when the first datais received, and the HARQ-ACK information for the second data isreceived after four subframes later from a subframe when the second datais received.
 19. The BS of claim 16, wherein the second CC is the PCC,the HARQ-ACK timing for the first data is determined based on a TDDHARQ-ACK timing, the HARQ-ACK timing for the second data is determinedbased on the TDD HARQ-ACK timing, and the HARQ-ACK information for thefirst data and the HARQ-ACK information for the second data is receivedon the second CC with the determined HARQ-ACK timing for the first dataand the determined HARQ-ACK timing for the second data, respectively.20. The BS of claim 19, wherein the TDD HARQ-ACK timing is determinedbased on an uplink(UL)/downlink(DL) configuration of the second CC.